#LACK

1069 The Black Hole of Numbers(20 分)

Forany4-digitintegerexcepttheoneswithallthedigitsbeingthesame,ifwesortthedigitsinnon-increasingorderfirst,andtheninnon-decreasingorder,anewnumbercanbeobtainedby...
代码星球 代码星球·2020-04-08
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